Malicious PDF — malware analysis report

Static analysis result for SHA-256 b960be8eb35dbef7…

MALICIOUS

PDF

112.3 KB Created: 2021-06-28 01:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9ef747461ea907a2960910b9f6f73c6 SHA-1: 933b2129efd27a3d199adcb8109bdcf3e9f9fa73 SHA-256: b960be8eb35dbef73780dae998eecb9886e956c74e53b4b49a3ebcf7db9744ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to lure users into phishing or malware downloads. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=analysis+of+competing+hypotheses PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c0drvaq8sel38pd4gf28t9mc9a/xexukapibujafis.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/063lklo38oka0c398rl9nm5hr2/vuzajipekebefoga.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9tjniah3vat1tro32vu3cbs3j1/mugesavi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9dc02c80---kufijifapedasadi.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9f54109f81c38604b90211427357c935/xodigukisobit.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lubulutimojebax.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e5e81ec06c6466f84ecb29cdc8aec03b/degoko.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644c11be16---teraxuluwaduzuwepu.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/94746681568.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56d558f93---96739498664.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/44bdc08cef48a8766549ac506c4d7d00/xowadubozaxizidudiwabaw.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/52030228426.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d037a0e9137---47047237915.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/61b71f225598b5c5f5c56786018a4adb/9475527225.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e825b59d---29691032281.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e5c5e93baf083d48aa181283ef7a3824/bovodumezep.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/vawifilob.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210602223434.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/97675950601.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/536209273.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/83635595346.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6aa7af6547f3413f52bf7f45254f7415/9881771702.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608996976b97b---daduveve.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 10924 bytes
SHA-256: 58f9b30452ee192cb1ad870875c690e3d9a0a9f5a1e6f5aaf5637648b8ab44f9
font_01_sfnt_off00016a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001822a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1822A 18692 bytes
SHA-256: 0dc0f306011862c30def73e0ee57daf9655a544b92614e54124e09eaaab47d33

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